Pump



B. s, AIKMAN. PUMP.

APPLICATION FILED JULY 28.191?- Patented Nov. 23, 1920.

2 SHEETSSHEET I.

W rdvwmlvv/ UNITED res PATENT FFICE.

BURTON s. AIKMAN, OFMILWAUKEE, WISCONSIN,

ASSIGNOR T NATIONAL BRAKEH&

, cous n.

' a citizen of'tlie United States, residing at Milwaukee, inthe county of Milwaukee and State-of lVisconsin, have invented a certain new and useful Improvement in Pumps, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification,

My invention relates to pumps and particularly to pumps of the type employed in faucet controlled systems. I

In systems of that type the pump is submerged in the-source of watersupply to be pumped, air is supplied under pressure from a tanklor other source, and the. discharge pipe of the pump is connected to the supply pipe of the system which may be the pipe and faucet of a residence or the like. So long as the faucets are closed the back pressure stalls the pump and it ceases to operate. When the faucet or other outlet is opened the pressure is relieved and the pump operates in accordance with the de: mand for water. I

Pumps of this class are generally controlled by float operated valves. In that type of valve control the float followsthe water level in the pump and shifts the valves when the water level has reached the extreme position.

According to my invention a piston is employed to move the water and a shifting of the valve is occasioned by the movement of this piston particularly by arrival of thepiston inits extreme position. This provides plenty of power for moving the valves as the piston is driven directly by the motive fluid. 1

Numerous. incidental objects and advantages will the apparent from the following specification in which I describe a specificembodiment of the invention.

In the drawings accompanyingan d form-- ing apart of this specification, I 7

Figure wit-is a general diagram of the Fig. 'is a longitudinal "section of the P m Fig. 3 1s a s 1larsect1on taken at right angles to the section of. Fig. 2; and

Fig. 4.- is a plan view of the pump.

PUMP.

As is shown in Fig. 1 the pump 1 is lowered into the well 2 a substantial distance below the level 3 of the water in the bottom of the well.

' Compressed air is supplied to the pump 1 from the tank 4 by way of a pipe 5 which runs down to the pump 1 and is connected at the threaded socket 6 in the head of the pump. The tank 4 is replenished with compressed alr either automatically or by manual control as desired. The compressor 7 is driven by the motor 8 for charging the compressed air into the tank at at the pressure. The pipe 5 leading to the pump 1 is supplied with a suitable shut-off valve 9, air strainer 10 and reducing valve 11. This reducing valve is of the type shown in m copending application, Serial No. 7 3,100, filed January 20th, 1916, although any preferred form may be employed. A pressure gage 12 is connected to the pipe 5 on the reduced pressure side of the valve 11. A release cock 13 is also connected 'to the reduced pressure side of the valve 1l.-

A discharge pipe 14 connected at its lower end to the threaded socket 15 in the head of the pump 1 leads the water discharged by the pump to the air spring 1 6 and to the supply pipes 19 and 20 leading to the faucets 21, 22' or other outlet. The tank 16 which I term the air spring is a, closed tank in which a quantity of air at suitable presa suitable buffer or spring for permitting proper Specification of Letters Patent. Patented Nov. 23, 192() Application filed July 28, 1917. Serial No. 183,294.

the accumulation of a certain amount of Wa- 1 'ter between strokes of the pump.

An exhaust pipe 23 is connected to the threaded socket 24 in the head of the pump point above the water- 1 and leads to a level 3. y

I The pump 1 comprises an outer cylinder 25 and an inner cylinder 26. The space 27.

between the cylinders communicates with the discharge pipell by Way of the thread- ,ed socket 15. closed ofi'at'the upper end by a head mem- The cylinders 25 and'26 are her 29 and at "the lower end by the foot member 30. I The head member 29 has an interior cylindrical threaded portion 31 to which the inner cylinder 26 is fastened by screw threads.

The foot member 30 is provided with acylindrical portion 32 to which the inner 26. The piston 43 is.

cylinder 26 is secured by screw threads. The outer cylinder 25 engages a shoulder 33 on the head member and a shoulder34 on the foot member between which shoulders this outer cylinder 25 is securely held.

Thefoot member 30 has an annular valve port 36 closed by the foot valve 37. The water from the well is adapted to enter the inner cylinder 26 through this foot valve. A suitable screen 38 is fastened to a boss 39 on the foot member, the screen serving to, exclude foreign matter. The foot member '30 is further provided with discharge ports 40 between the interior of the cylinder 26 and the annular space 27, these ports being nor mally closed by the toroidal rubber rings 41 which serve to close off the annular ports 40, these rings 41 fitting in V-shaped grooves which encircle the foot member 30 at that point.

The inner cylinder 26 is adapted to receive a piston'43 guided on a stem or piston rod 44 axially mounted within the cylinder provided with leather cups or packings" 45,46 facing in opposite directions and serving to make a tight fit between the piston and der. This piston 43' is adapted to be driven downward by the pressure of the air is held in place by the cap member 50. The

valve 47-is normally held against its seat in the cage 48 by means of the spring 51. The stem 52 of the .valve 47 is connected by means of a yoke 53 to the piston rod 44. A pin 54 is secured in the end of the rod 44 and this pin lies in a vertical slot in the arms of the yoke 53'. The valve 47 controls the release of pressure in the bottom of the cylinder 26 by permitting the escape of parts of the liquid out'by way of the central axial .passage 55.

The head member 29 contains a central axial-passage 57 communicating with the admission chamber 58, this communication being controlled by a valve 59 which has a hollow stem 60 closely guided in the central axialpassage 57. The valve member59 is provided'with the spring 60 which tends to drivethe valve 59 down upon its seat 61. 'The lowerend of the valve stem 60 is adaptwhen ,this

edltoengage' the upper end of the rod 44.

th'evalv'e. The rod'44 is'prov'ided with. a

' central axl'ahpassageway 64 communicating .with theside outlets 65 in the top of the cylinder. Thus when the'valve 59 is um der 69.

the rod and cy'lin which is admitted at the top of the cylinder and rod is in'oved upward to unseat.

exhaust valve upon this sleeve. The exhaust valve 70 has a sleeve 71 guided upon the sleeve 68 and adapted to play between the shoulders 66 and 69. A coiled spring 72 normally holds the valve against the shoul-' An annular exhaust passage 73 "communior shoulder 66 which is guided in thecates with the exhaust pipe 23 by way of the threaded socket 24. The exhaust passage is defined between two annular walls which terminate in the valve seats 75 and 76. The valve member 70 has a yielding face adapted to engagethese valve seats and to close oif the exhaust passage 73.

The operation of the admission the release ,andthe exhaust valves is accom lished by the piston 43 engaging the shoulder 69 at the upper end of the rod and by'engaging the yoke member 53 at thelower end of the rod, l

The operation of the pump is'as follows: Assuming that the tank 4 is chargedwith a suitable pressure of air and that the faucets or outlets 21, '22 are opened or partially opened so that the pump can operate,- and assume further that the parts are in the position shown in Figs. 2, 3. As shown in Fig.

2 the admission valve 59 is opened and comv is nearly completed the lower boss 78 on the piston 43 strikesthe 'top of theyoke 53 at the bottom of the pump; and forces the release valve 47 ofi'- of its seat.. This permits the water between the piston 43 and the foot member 30 to escape by way of the passage 55 relieving the pressure on the lower sur' face of the piston 43. The entire power of the piston is then exerted upon the yoke 53 and this pressure is in turn transmitted to the pin 54 and'to-the rod 44 itself. As a consequence the rod 44 is pulled downwardly compressing the spring 72 between the annular ring 66and the valve 70 until the valve 70 is forced ofi' of its seat with a snap motion due to the spring. In case the pressure of'the spring is insufficient to move the valve 70 off of its seat engagement of the annular'ring 66 withfthe sleeve 71 of the valve 70' insures positive opening of this valve 70. The initial: motion of compressing the spring permits the admission valve 59 to close so that bythe time the spring is compressed sufiiciently to raise the exhaust valve off of its seat the admission valve 59 is closed and the-supply of compressed a1r has been shut off.

As the exhaust valve 70 is opened the air in the top of the cylinder escapes and the submergence of pressure of water on the bottom of the piston 43 forces the piston 43 upward along the rod 44 until it strikes the shoulder 69. It is to be noted that the rod 44 and connected parts remain in the position in which they were moved by the last part of the stroke of the piston 43 until they are again moved upward. As the piston 78 starts back on'its upward stroke and travels away from the yoke 53 the. spring 51 forces the valve'47 against its seat, thereby .permitting the valve 47 to close even though the rod 44 does not move upwardly immediately. lVhen the boss 79 on top of the piston 43 strikes the shoulder 69 the admission valve 59 is forced off of its seat and the exhaust valve 70 is forced uponfits seat. As the admission valve 59 opens up with a snap action the exhaust valve 70 also closes with a snap action due to the changes in effective area caused by shifting of these valves.

In order to prevent sticking of the piston in' the cylinder and thus stopping the pump I have provided a small pressure transmitting opening 80 through the annular walls of the foot member above the check valve 40. This opening 80 which is formed by a No. 60 drill forms a direct communication between the bottom of the cylinder and the discharge passage 27. In case the piston 43 sticks during upward movement the passage 80 permits of the transmission of discharged pressure so as to start the piston 43 on its upward movement.

It can be seen that the opening of the release valve 47 permits of the application of the entire pressure of the piston 43 to the valve rod 44 for opening the exhaust valve and closing the admission valve. As the area of the exhaust valve is large, considerable power is required to move it off of its seat.- If the compression of the spring 72 is insuificient to open the valve the posltive engagement of the shoulder 66 with the sleeve 71 forces the valve open at once. a

I claim:

1. In combination, a head member, a foot member, a pair of cylinders concentrically secured to said head and foot members, a

foot valve through the foot member -c0m-=' municating with the interior cylinder, check valves between the innercylinder and the space between said cylinders, admission and exhaust valve members in said head member, and piston means fitting inthe inner cylinder for operating said admission and exhaust valves and a bleeder passageway between the inner cylinder and the outer cylinder below the piston means.

2. In a pump, a working cylinder of univalve adapted to be, held on its seat by the pressure of the compressed air, a piston member moving with the water level throughout the length of the cylinder, said piston member having a lost motion connection with said valve, means for admitting compressed air on one side of the piston member, means for admitting water on the other side of the piston member, and a spring adapted to be compressed by the downward movement of the piston member to throw the exhaust valve clear of its-seat.

3. In a pump of the class describecha working cylinder of uniform diameter throughout for both compressed air and for water, an exhaust port for compressed air, an exhaust-valve adapted to be held pn its seat by the pressure of the compressed air, a member moving at all times with the, water level and having .a lost motion connection with said valve, means "for admitting compressed-air on one side of the piston member, meansfor admitting water on the other side of the piston member, and'a spring adapted to be compressed by the downward movement of said member to throw the exhaust valve clear of its seat.

4. In a pump of the class described, a working cylinder of uniform diameter throughout, for compressed air and for water, an exhaust port for'compressed air, an exhaust valve adapted to beheld on its seatby the pressure of the compressed air, a piston member movable in one directionby the pressure of the compressed air, and movable in the opposite direction by'su'bmergence pressure, said member having a lost motion connection with the valve, and a spring adapted to be compressedby the downward movement of the member to throw the exhaust valve clearof the seat. -,5. In a pump of the class described, a working cylinder, an exhaust port, an ex haust valve adapted to be held on its seatr by pressure ofthemotive fluid, a member moving at all times with the water level and I having a lost motion connection with said, exhaust valve, anda spring adapted to be compressed by the downward movement of the member to throw the exhaust valve clear of its seat and arelief valve adapted to be actuated by saidv m mber when said spring I foot member, said release valve having a lost motion connection with said piston rod, an admission valve in said head member, said admission valve having a lost motion connection with the piston rod, an exhaust valve, a spring connection between the exhaust valve and the rod and a shoulder for following up the connection between the rod and the valve. I

9. In ,combination, a pump cylinder, a piston in said cylinder, a central axial rod in said cylinder, a head member for the cylinder, a foot member for the cylinder, a foot valve in said foot member, a check valve in said foot member, admission and exhaust valves in the head member, an outer cylinder concentric with said first cylinder, and a pressure-transmitting passage between the inner cylinder and the space between said cylinders, said check valve forming the discharge connection between the interior of the first cylinder and the space between said cylinders.

10. In combination, a cylindrical inner sleeve, a cylindrical outer sleeve extending below the inner. sleeve, a cylindrical foot member closing the outer sleeve, a second 0 lindrical foot member of smaller diameter 0 osing the inner sleeve, an annular space being formed between said second foot member andithe outer sleeve. a peripheral port opening through-the'wall of the inner foot member to form communication between the inner sleeve and the annular space, and a toroidal elastic ring covering said port, said foot members being connectedtogethe-r to form a closure for the annular space.

' 11. In combination, a pump cylinder, a head member, a foot member attached to said pump cylinder, a movable piston in said cylinder,.an admission and an exhaust valve in the'head of the cylinder and a relief valve in the foot member, said valves beingoperated by movement of the piston, said piston being moved in one direction by submergence pressure of the liquid about the pump cylinder and in the other direction by pressure of themotive fluid.

12. In combination, a pump cylinder, a

1 .head member for the cylinder, a foot memher for the cylinder, a piston fitting in said cylinder, a'rod adapted to be operated by ,said piston, admission and exhaust valves in the head ofthe cylinder,'a rellefvalve 7 in the foot member of the cylinder and lost motion connections between said rod and the relief valve, said piston being moved in one direction by the submergence pressure of the liquid about the plunger and in the other direction by pressure of the motive fluid.

13. In a pump, a working cylinder having outlet and discharge valves forliquid, an-

exhaust valve and an admission valve for motive fluid, a piston slidably mounted in said cylinder, spring means tending to open the exhaust valve and close the admission valve, a piston rod adapted to be connected to said piston for opening the exhaust valve and closing the admission valve for low level conditions in said pump and a relief port for discharging liquid from'below the piston when the piston operates to shift the valve.

15. In a pump, a cylinder havin a head member, said head member comprising an upper axial passageway for the admission of motive fluid, an enlarged axial passageway below said first passageway for exhaust, an admission valve for the upper passageway closing downward. a valve for forcing said valve downward, a common operating stem for the admission valve and the exhaust valve, the exhaust valve being slidably mounted on said operating stem, spring means onthe stem for holding the exhaust Valve toward its open position and motor means within the pump cylinder for alternately raising and lowering said operating stem.

16. In combination, a pump cylinder, a head member for said cylinder, said head member having an upper axial passageway,

passageway in the admission valve.

17. In combination, a pump cylinder, a head member for said cylinder, said head member comprising an admission port, an admission valve for said port, a spring tending to close said admission valve, an exhaust port, an exhaust valve adapted to close said'exhaust port, an operating stem masses for ope ating both of said valves, said stem having lost motion connection with each of said valves and means within the pump cylinder for operating said stem.

18. In combination, a pump cylinder having a head member, said head member comprising an axial admission port, a valve for obstructing said port, a spring tending normally to close said admission valve, an annular exhaust port, an exhaust valve for obstructing said port, an operating stem adapted to ope ate both of said valves, a spring connecting the exhaust valve and the operating stem, and motor means within the pump cylinder for operating said stem to open the exhaust valve and to close the admission valve.

19. In combination, a pump cylinder, a head member for the pump cylinder, an axial admission port, a valve for obstructing said port, a spring for holding said valve in position to obstruct said port, an annular exhaust port having a central sleeve, an operating stem guided in said sleeve, an exhaust valve for obstructing the exhaust port, a spring connection between the exhaust valve and the operating stem, and motor means in the pump cylinder for operating said stem.

20. In combination, a pump cylinder, a head member, a foot member, admission and exhaust valves for motive fluid, inlet and discharge valves for liquid, a piston fitting in the pump cylinder, a piston rod connected to said valves, said piston being moved in one direction by pressure of the motive fluid, and being moved in the other direction by the submergence pressure of the liquid about the pump cylinder, said foot member having a small port between the interior of the cylinder and the discharge side of the discharge valve.

21. In a pump, a pair of cylihdrica I tubes, arranged one within the other, a head member for closing off the tops of both of said tubes, and a foot member for closing off the bottoms of both of said tubes, adischarge passageway through the foot member connecting the lower end of both of said tubes, one of said tubes forming a pumping cylinder, pressure fluid valve mechanism for the pumping cylinder, a movable motor piston moving with the water level in thepumping cylinder and adapted to be operated u on low level conditions by pressure fluid or shifting the pressure fluid valve mechanism, a hollow threaded rod connected to the foot member, said rod providing a relief passageway and a relief valve adapted to be operated by the motor piston when it shifts the pressure fluid valve mechanism.

22. In a pump, a pair of concentric tubes, one within the other, a head member for closing off the tops of said tubes, a separate foot member for each of said tubes, said separate foot members being connected together to form a tight joint between them, a threaded rod connecting said foot members, said rod having a relief passage therethrough, a relief valve controlling said passage, and a motor piston within the inner tube adapted to operate the relief valve upon low level condition within said inner tube.

23. In a pump, the combination ofa piece of tubing forming a cylinder, a head member closing the upper end of the cylinder, at

foot member. closing the foot of the cylinder, a casting having a water discharge port controlled by a check valve, a pipe connecting the head memberand said casting, a rod connected to said casting and passing through the foot member, said rod hav1ng means for I mechanically connecting the casting and the foot member and having a relief passageway therethrough, and a relief 'alve controlling said passageway.

24. In a pump, the combination of a piece of tubing forming a cylinder, a head member closing the upper end of the cylinder, a foot member closing the foot of the cylinder, a casting having a water discharge port controlled by a check valve, a pipe connecting the head member and said casting, a rod connected to said casting and passing through the foot member, said rod having means for mechanically connecting the *asting and the foot member.

25. In a pump, a working cylinder of substantially uniform diameter throughout, a piston member movable in said cylinder, an admission valve for admitting motive fluid above the piston member, an inlet check valve for admitting water below the piston member, an exhaust port for the upper end of the cylinder, an exhaust valve therefor, a discharge check valve for the lower end of the cylinder, means tending normally to hold the admission valve closed and the exhaust valveopen and an operat 

